It was about 9:42pm to about 9:45pm May 24, 2015. Section 303 row 21 seat 12 in petco park. Something green caught my eye. It was likely miles away. It looked like it was about the size of a large star. From what I could see it looked grey and it was wider than it was tall. I couldn't make out an exact shape or color due to the night's sky and I have excellent eye sight. It started about 22 degrees north. The light was singular and it didn't blink a single time. It began to head west. As it did so it began to slowly curve upwards. Then it slowed down and shot upwards and back down about 10 to 15 degrees and shot back down within 2 seconds. It continued to the west. Once it reached about 0 degrees north it instantly turned back around to the east without stopping or slowing down. At about 5 degrees north it shot upward and back down in a similar way and about the same height as the time before, but this time it didn't slow down before going upward. It then went east until it was out of sight. Before and after I had seen several airplanes land, but only after the event did I see helicopters. I personally have never seen any object move in a way such as this. And I also have never seen a helicopter or any sort of airplane with a single green light. And also I must add airplanes and helicopters have blinking lights that aren't constant. And considering this is the 4th time I have seen unexplained objects in the San Diego area, I'm beginning to be less skeptical. I believe if people would look at the sky every once in a while, they would see these kinds of things more often. If you're ever on the phone at night, look out your window at night. It's something simple that could help you witness something from out of this world.